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    <title>Document</title>
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    <p>hello</p><!--16px浏览器自带-->
    <div style="font-size:20px; height:300px;background-color: beige; color: yellow;overflow: hidden;">
    <p style="color: yellowgreen; background-color: black;height:inherit;">你好</p>
    <div>111</div>
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